Love It or Hate It? Jennifer Lopez on Letterman Today, Jennifer Lopez visited the "Late Show with David Letterman" along with former Federal Reserve chairman Alan Greenspan. Wonder if Alan and J.Lo hit it off and started talking about Keynesian economics. She may be keeping mum on whether she's about to be a mum, but there's no shortage of attention-getting looks in her wardrobe. I'm not loving the Village People hat, but her smoky eyes are certainly dramatic. But are they too dramatic?